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HomeAccessory Dwelling Unit Adu House PlansCharming Garage Apartment with Private Suite and Modern Amenities

Charming Garage Apartment with Private Suite and Modern Amenities

Plan #AD6378-A · 640 sq ft · 1 bd · 1 ba · 2.0 story · 2-car

Accessory Dwelling Unit Adu House PlansCarriage House Plans Garage Apartment Plans Adu DesignsCottageTwo Story
★★★★★Read 687+ verified reviews →
Estimated cost to build the home
$95k – $160kFree zip estimate ↓
Have questions about this plan? Book a free plan review with David →
David Park · Residential Plan Advisor · 30+ years
640
Sq Ft
1
Beds
1
Baths
2.0
Stories
2
Garage
8′
Ceilings
“We kept coming back to this plan — it just felt right for our family. The flow between the kitchen and living room works.”Verified buyer · Trustpilot
40+
Years in Business
3,000+
Plans in Catalog
10%
Beat Any Competitor Price
Expert
In-House Design Team
Quick self-check · 30 seconds

Is this the right plan for you?

Most regret comes from buying a plan that doesn't fit your life. Skim this before you decide.

Great fit if you…
  • Building an accessory dwelling unit on a modest footprint (30 ft wide, 26 ft deep)
  • Seeking rental income or guest accommodations without expanding the main house footprint
  • Want laundry access integrated into the master suite for efficiency
  • Working with a property that benefits from a combined garage and living structure
  • Prefer a detached carriage house design with traditional styling
! May not be the best fit if you…
  • Need 2+ bedrooms — this plan has only 1 bedroom
  • Want multiple bathrooms — this layout includes just 1 bathroom
  • Require substantial living space — 640 square feet may feel tight for permanent occupancy
  • Prefer a single-level layout — this is a two-story structure

This plan tends to appeal to:

Accessory Dwelling Unit BuildersRental Property InvestorsMulti-Generational FamiliesEmpty Nesters with Guest NeedsHome Office Seekers
Think this is the one? Choose your package above and check out when you're ready.Yes — this plan fits me →

Floor Plans

Tap to zoom · Download sample

Main Level — 640 sq ft · 30.00′W × 26.00′D

↓ Free Sample
floor plan

Choose Your Package

Not sure? Call us — we'll help
PDF Set
Build as-is or minor changes
$890
  • Complete working drawings (PDF)
  • Instant delivery to your email
  • Unlimited build license included
  • Copyright release — print as needed
  • AutoCAD DWG files not included
5 Prints
$990
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
5 Prints + PDF
$995
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed
CAD Set
Significant modifications or custom design
$1,750
  • Complete construction drawings
  • Unlimited build license included
  • Copyright release — print as needed

About this plan

Two-Story Carriage House for Accessory Living

This carriage house plan offers 640 square feet of heated living space on the second floor, positioned above a 780 square foot 2-car garage. With a 30-foot width and 26-foot depth, the compact footprint fits efficiently on diverse property configurations, making it an ideal accessory dwelling unit for guest quarters, rental income, or a private studio.

The second-floor residential layout prioritizes efficiency with a primary suite, full bathroom, and open-concept living and kitchen area. Laundry access is integrated directly into the master closet for convenient daily circulation. Eight-foot ceiling heights throughout the living quarters provide standard vertical clearance, while the garage features 9-foot ceilings to accommodate taller vehicles and overhead storage.

The structure reaches a maximum height of 22 feet 3 inches with an 8:12 roof pitch, presenting a traditional exterior profile that complements existing main dwellings. The design maintains a clear separation between the ground-level garage utility space and the private residential unit above, ensuring quiet, independent living quarters.

What's included in this plan
  • Exterior elevations (all sides)
  • Detailed floor plan(s) with dimensions
  • Foundation plan
  • Roof plan
  • Schematic electrical layout
  • Building cross-sections
  • General notes & specifications
Not included (handled locally)
  • Architectural / engineering stamps
  • Site & grading plan
  • Structural / framing calculations
  • Plumbing & HVAC layouts
  • Energy-compliance documents
  • Material take-off list
These are typically prepared by your local builder or engineer to meet your jurisdiction's requirements.

Complete Plan Specifications

Total Living (heated)640 sq ft
2nd Floor640 sq ft
Bedrooms1
Full Bathrooms1
Stories2.0
Width of House30′
Depth of House26′
Building Height22′3″
1st Floor8′
2nd Floor8′
Garage9′
Garage2-car, front-load
Garage Area780 sq ft
FoundationSlab
Wall Framing2x6
Roof FramingStick
Roof Pitch8:12

Key Features

2.0-story layout
1 bedrooms · 1 full baths
8-ft ceilings on the main level
2-car garage
30.00′ × 26.00′ footprint
Unlimited build license included
Copyright release — print as many copies as you need
Builder-friendly construction drawings

Modify This Plan

Free quote in 1–3 business days · In-house design team
In-house design team · Family-owned since 1983

Need a 4th bedroom, a different foundation, or 8 more feet of width?

Two quick steps. We'll reply with a fixed-price quote — no obligation, and no charge until you approve.

1–3 days
To send your quote
~2 wks
Typical revision time
Free
Until you approve
Direct
To the architect
1
Your contact
2
What to change
PLAN
Plan #AD6378-A
GARAGE · 640 sq ft · 1 bd / 1 ba / 2-car

First — where should we send your quote?

We only ask for what we need to get back to you. No address, no marketing.

Free quote — no charge until you approve·Direct to our in-house architect·40+ years modifying plans

What will this cost to build?

Most buyers are off by 20–30% before checking this.
Budget
$293k
Most common
Mid-range
$340k
Premium
$382k+
Modeled on Wichita, KS — our US price-baseline city. Use the form below to generate an exact estimate for your own location.
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Still deciding?

Book a free 15-min plan review with David Park.

David has 30+ years in residential design and construction documents. He'll walk through this plan with you — foundation options for your lot, modification possibilities, and exactly what's in the construction documents you'd receive. No pitch. No fee.


Reviews across all our plans — see plan-specific reviews on Trustpilot →

★★★★★

JoAnne and the entire staff was extremely helpful and patient with us while we decided between 2 homes. Outstanding curb appeal and a great layout perfect for us.

R
Rita Long · Milwaukee, WI
Plan: Cranberry Gardens
Verified buyer · Trustpilot
★★★★★

We've had an amazing experience with our new home. The customer service we received during our modifications was exceptional — they walked us through every change.

S
Sandra Hawkins · Montgomery, AL
Plan: Dunrobin Castle
Verified buyer · Trustpilot
★★★★★

We compared three plan sources and Archival's pricing + free design call won us over. Our builder said the construction docs were the cleanest he'd seen.

M
Mark Chen · Boise, ID
Plan: Pepperwood Place
Verified buyer · Trustpilot

→ Read all 687+ reviews on Trustpilot


Frequently Asked Questions

Can't find your answer? Call (888) 890-2353

For most buyers, the PDF Set is the right choice — instant delivery, unlimited build license, and easy to share with your builder. If you plan significant modifications or are building in CA, OR, WA, or NV, go with CAD + PDF so your designer can edit the source files. Still not sure? Call (888) 890-2353 and a real person will help you choose.

Still have questions about this plan? Talk to a real person — no pitch, no fee.

Starting at
$890
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